522 



POACE^, 



Mexico, Parrij tf- Palmer 035, Schaffner 1035, Pringle 2051. 

 3'243. 



Tliere is souic doubt about tlie correct ideutiticatioii of this 



grass. 



Fig. 107.— Zfmrt rotundata. Spikelet dissected. (Scrlbner.) 



U-2. (-iol). Demazeeia Dum. Coram, liot. -.'G (lS^>-^>). Desnia- 

 zet'ia Dum. Obs. (inun. lielg. 40 (1823). Brizojii/ni'ii lAnk, Jlort. 

 Berol. 1:150 (lS-v>7). 



Splkelets maay-flowered, compressed, sessile or some of tlie 

 lower pedicellate, racliilla articulate between the flowers. (Jlumes 

 keeled, coriaceous, obtuse or mucrouate-acute, awnless, the empty 

 ones persistent, 3-5-T-nerved, shorter than the floral glumes: floral 

 glumes 7-nerved; palea rigid, about the length of its glume, 2- 

 keeled near the margins. Stamens 3. Styles short, distinct, stig- 

 mas feathery. (J rain oblong, slightly obcompressed, concave in 

 front, enclosed, but not adherent to glume and palea. 



Annuals or perennials with narrow involute leaf-blades. Spike- 

 lets conspicuously distichous on two sides of a 3-sided rachis. 



There are about four species known, one of them in the vicinity 

 of the Mediterranean, the others in South Africa. Xearly allied, 

 to DisticJtlis. 



